I have a 2004 Chev Trailblazer - 33000 miles. There is a whining sound when the car starts. It also seems to rev high but then drops back once the vehicle is started for a few minutes. I just had the idler pulley (hope that's correct) replaced. The noise is still there. I notice it more when I am traveling between 10 MPH to 30 MPH when I am traveling on the highway I cannot hear it.
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